Ignition governor



mentes July 24, 1934 5 1,967,445

UNITED STATES PATENT OFFICE IGNITION GOVERNOR Marion Mallory, Toledo,Ohio, assigner to The Mallory Research Company, a corporation ofDelaware Application May I8, 1931, Serial No. 538,187 9 Claiml. (Cl.2GB-31) This invention relatesfto an ignition governor advance of thespark in accordance with. the capableoi controlling the timing of the.spark lincreased speed of the engine while the other in accordance withthe speed of the engine. acts merely asa counterbalance. Each weight Inengines of different makes and even in 22 is' provided with 'a pin 24and the pin on d dinerent engines of the same make, in 'order to theuppermost weight is adapted to be received 00 obtain the greatestpossible emciency, it has in a slot 25 in the cam plate 19. been `foundnecessary. to correctv or adjust the In'order that the maximum possibleadvance rate at which the spark isA advanced as. comof the spark may belimited in accordance with pared to the increased speed o! the engine,and the. operation of any engine to'which the gov- 1d in most cases theadvance at the lower speeds, ernor may be applied, the plate 19.' isformed G6 say below 800 R. P. M., requires a dierent rate with a numberof slots 25- which, in the present than at the higher speeds. Also, insome eninstance, respectively represent anadvance of gines, the'maxim'umadvance at high .speed 15,20, 25, 30, 35 or 40 with-reference to shouldbe less than in others. the rotation of the timer shaft. In Fig. 3, the1I With the above conditions in mind, it is an pin 24 of the governorweight 22 is represented Y0 object 'of the present invention to providea as engaging the 20 slot, the initial position of governor which may beadjusted more accuthe governor weight being represented by a rately thanthose heretofore used, particularly dotted line Aand the position of thegovernor in order to meet these various conditions. As -weightand theslot at the maximum advance .10' a result of `my improvedl constructiona single of `the spark being represented bydot and dash 7i.

governor may be adapted for-use in connection lines. v l with diilerentengines which differ greatly in The position of the plate 14, with theweights 'their operation. 22, and of 'the cam plate 19 as represented inthe The invention. hi itil preferred 10m. will be drawings is tor aright hand rotation of the more particularly described `in connectionwith timer shaft asindicated by the arrow a iii-Fig. 80 the accompanyingdrawing, in which` 2. Ii' the governor is. applied' to a. timer shaftFigure 1 illustrates the invention partly in having a leithand rotationthe cam plate 19 elevation and partly in section;l and the plate 14carrying the weights 22 should 'Figure 2 is aplan view of the governorwith b inverted vThis change is ,easily made by a0 the cam plate andsleeve removed; removingthe screws 21 and the nut 13 respec- Figure 3 isa plan view of the cam plate and tively. sleeve, illustrating 9.180 theDOSiOn 0f the BOV- In -orde'r that the advance of the spark may ernorweight with reference thereto: v beproperly controlled at both lovv'erand higher Figure 4 is a section taken on the line 4-4 speeds, thecentrifugal' action'of the weight 22 il of'Fig. 2; and is resisted firstby a primary spring 26 which Figure 5 representsa chartshowing advanceengages a rolier2'l onthe governor weight and curves for variousadjustments oi the cam piatelater by asecondary spring 28 as the speedin-' In carrying out my invention, the timer vshaft creases. Each o! the.springs 26 and 28 may .l0 is reduced at its ,Upper end t0 form an B11-be composedof a number of thin leaves which do nular' shoulder 11. Abovethis Shoulder is a may be selectively removed or inserted to ad- 95threaded portion 12 on which 1S a mit 13 adapted just the timing inaccordance with'V the operation t0 clamp 51215116 14 against theshoulder 11- of the engine. Bothsprings are secured at their The smoothupper portion 15 of the shaft oor-l rear ends to an upstanding lug 29 onthe pme ries a 'sleeve 16 on' which is keyed a circuit- 14 by means ofScrews 30 and 31, a washer 32 -45 breaker cam 17. The lower end Iofthesleeve and a spacer 33 By lemovmgsome of the 100.

l1611s formed with a circumferential ange 18 leaves of the rm 28 theadvance wm begin towmch a universal "am plate 19 is clamped by at alower The rate of advance will bemeans of a collar 20 and screws 21. l

obviously, the cam piste 19 maybe set in m 1 as the spring 2 engages *hemi 8. By tightening the screw 31, drawing the Boany positioncircumierentially of the sleeve 16 2 105 in order to secure a properinitial timing or the free end 0i me spring 28 'mud the Spring 2 spark.Two governor weights 22 i are 'disposed the 510W fate 0f advanm begin ata lower symmetrically with reference to the shaft 10 and Speed BYincrein the mentire length 0f the are pivotally mounted .on pins 23secured to the screw 31,' 0r if,` n. by inserting a M081' 5l' plate 14.One of these weights controls the 33 of greater thicknessthe slower rateof adu the secondary eii'ect only at Vance under the inuence of spring28 may be caused to take a higher rate oi' speed.

In the chart 34 represented in Fig. 5, the lines 35 represent thedegrees of spark advance with reference to the speed of the engine forvarious settings oi' the cam plate 19, the other settings of thegovernor remaining the same. In this chart, the abscissas represent thenumber of revolutions per minute and the ordinates represent the degreesof advance of the spark ahead of dead center position of the piston. Theiixed setting representsv an advance of 15 and the tension oi the spring26 is such that the governor begins to move outwardly at about 500 .R.P. M. while the secondary spring 28 takes eifect at about 800 R. P. M.'Ihis is a correct setting for many engines 'requiring a rapid advance of the spark between 500 and 800 R. P. M. and then a slower advance. Thelgovernor may be adjusted for engines requiring a substantially straightline advance or, in other words. a uniform spark advance for all speeds,by setting the secondary spring so that its tree end substantially'touches the primary spring when at rest. By varying the strength of thesprings the maximum advance may take place at any speed desired. l

From the foregoing description, it will be understood that a speed curvewith any desired rate of advance, either at lower or higher speeds maybe obtained merely Vby the proper adjustment. Also, bypropervadjustment, the beginning and end of either rate of advance maybecaused to take'place at any desired engine speed.

While I have shown and described specifically one embodiment of theinvention, it will be apparent that the same may be modified in manyrespects without departing from the scope of the invention as deiined inthe claims.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent is:

1. In an ignition timer for internal combustion engines, the combinationwith means for advancing the timing of the spark as the speed of theengine increases, of means for limiting the angle' of maximum advance,means for adjusting such limit, and means for adjusting the control ofthe speed responsive means, so that the limit of advance will be reachedat' a higher or a lower speed.

2. In an ignition timer, the combination'with a centrifugal governor, ofa circuit breaker cam, and a plate having a plurality of radiating slotswith different angles of advance, said plate being adjustable withreference to said cam and governor to bring any one of said slotsselectively into cooperative relation tu the governor.

3. In an ignition timer, the combination with a circuit breaker cam, ofa cam plate mounted for krotation therewith and having a plurality ofslots with different angles of advance, a centrifugal governor, andmeans for adjusting the trolling the advance of cam plate with referenceto the circuit breaker so that the governor selectively cooperates withany one of said slots to advance the spark in accordance with the speed,the selected slot deiining the limit of maximum advance.

4.' In an ignition timer, the combination of a shaft.' a member mounted`for circumferential advance with reference to said shaft, a circuitbreaker cam keyed to said member, a centrifugal governor mounted onsaidl shaft for consaid member, and an intermediate member having afixed circumferentially adjustable connection with said rstmentionedmember and operatively connected to said governor.

5. In an ignition timer, the combination of a shaft, al member mountedfor circumferential advance with reference to said shaft, a circuitbreaker cam keyed to said member, a cani plate secured to said memberand circumferentially adjustable with reference thereto, and acentrifugal governor operatively connected to said cam plate.

6. In an ignition timer, the combination of a shaft, a member mountedfor circumferential advance with reference to said shaft a circuitbreaker cam4 keyed to said member, a cam plate secured to said memberand circumferentially adjustable with reference thereto, said platehaving a plurality of slots of diiferent degrees of advance, and acentrifugal governor which may be operatively engaged with any one oi'said slots.

7. In an ignition timer for internal combustion engines, the combinationwith means for advancing theltiming of the spark as the speed of theengine increases, of a primary spring constantly resisting such advance,a secondary spring eiiective .to offer further resistance to suchadvance above a predetermined speed, and

adjustable means to cause the secondary spring to become effective at avhigher or a lower speed.

8. In an ignition timer for internal combustion engines, the combinationwith means for advancing the timing of the spark as the speed of theengine increases-,of aprimaryspring constantly resisting such advance, asecondary spring engageable with the primaryspring after the latter hasyielded to a predetermined extent to oppose further yielding thereof,and means to adjust the secondary spring to vary the position at whichthe primary spring becomes engaged thereby.

9. In an ignition timerv for internal combustion engines,the-combination with means for advancing the timing of the spark as thespeed of the engine increases, of a primary leaf spring and a secondaryleaf spring, both secured at one end, with their free ends normallyspaced apart in position to successively resist such advance, and meansfor adjusting the free end of the secondary spring` toward or away fromthe primary spring.

' MARION MALLORY.

